this has a ProBox surf box, can accept up to about 15cm fin. Router a hole and remove the gust to the bottom underside, fill with 8lb POUR Foam, re-router to correct depth, a jig from ProBox and router blade works brilliant for depth and the dimensions. Line hole with carbon(best) or fiberglass sheet

insert epoxy, box itself then and fill with epoxy, fin box is held in place with the jig, untill set. Once cured, remove jig and finish the box flush to the deck, I add a layer of fiberglass over the top to tie into the existing deck.

finish by sanding, and paint if desired.

will look for the ProBox instructions ....... go down to the grey line
PROBOX install and tab across

this has a ProBox surf box, can accept up to about 15cm fin. Router a hole and remove the gust to the bottom underside, fill with 8lb POUR Foam, re-router to correct depth, a jig from ProBox and router blade works brilliant for depth and the dimensions. Line hole with carbon(best) or fiberglass sheet

insert epoxy, box itself then and fill with epoxy, fin box is held in place with the jig, untill set. Once cured, remove jig and finish the box flush to the deck, I add a layer of fiberglass over the top to tie into the existing deck.

finish by sanding, and paint if desired.

will look for the ProBox instructions ....... go down to the grey line
PROBOX install and tab across

I asked a couple of "experts"
they go to the end of the mast track for the front, I went about 3" more towards the rear

middle or behind the mast track should be a good placement, the nice thing on the ProBox is you can fill the box, if not in use with a blank, thats lightweight_________________K4 fins
4Boards....May the fours be with you

The fin is really to give a chance for the kids to stay upwind and to be able to tack in lower winds.

The board dynamics are way different for kids and for adults too. My little girl was so small when she started that she wasn't even able to uphaul while keeping the board crosswing. The board was sitting so high in the water that it offered no lateral resistance, apart from the backfin.

I've seen other kids planing for short moments with the center fin. They looked overfinned though. As an heavy adult, with a larger sail I doubt I could plane with a centerfin. I would need to be way forward of the straps to hold the sail in proper position to prevent the board from going upwind. If possible, the technique would be quite different anyway.

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